I would give Slowbro Ice Beam over Headbutt for Lance, other than that it looks like you've got the Elite Four covered. Maybe add a Bug type to take down Alakazam, Jolteon's Pin Missile isn't that reliable (Jolteon is Special sweeper)
You could also lvl up, that will allow you to beat the E4 easily.
And these are kanto pokemons not hoen or heon whatever the spelling is.
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Spinda, Golbat, DuskullPearl:
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